Exhaust-valve for hammer-drills



L. C. BAYLES.

EXHAUST VALVE FOR HAMMER DRILLS.

APPUCATION FILED MAR12'9, 1917.

1,871,721 Patented Mar. 15, 1921.

8 F735. 2 AT RNEY' UNITED STA -Es "PATENT FF 'LEwrs c. IB'A-YLES, or'EAs'r'oN, PENNSYLVANIA, ASSIGNOR T0 INGERsoLE-RAivn COMPANY, or JERSEYcrrY, NEW JERSEY, A CORPORATION oE-EEwJEEs Y.

. EXHAUST-VALVE FOR HAMMER-DRILLS.

Specification of Letters Patent.

, Patented Mar. 15,1921.

7 Application filed March 29, 1917. Serial No. 15 8,-348.

To all whom it may concern:

Be it known that I,-Lnwrs C. BAYLES, a citizen of the United States,residing at Easton, in the county of Northampton and State ofPennsylvania, have invented a certain new and useful ImprovementinExhaust-Valves for Hammer-Drills, of which the following is aspecification.

This invention relates to hammer drills, and in particular to a valvefor controlling the exhaust port of such drills. r

The object of this invention is to improve the construction of theexhaust closing valve shown and described in my Patent No. 1,14%,991granted July 6th, 1915.

A further object of this invention is to provide a simple valve whichmay be used haust valve for hammer drills has been clevised, a practicalembodiment of which is shown in the accompanying drawings.

In the drawings annexed hereto and formin a part of this specification,

Iigure 1 shows an assembled view of a hammer drill with the improvedexhaust controlling valve in place, Fi 2, a cross sectional view takenon the line II of Fig. 1.

Fig. 3, a cross sectional view on the lin IIIIII of Fig. 2, p

Fig. 4, a cross sectional view on the line IV-IV of Fig. 2, and

Fig. 5, a cross sectional View on the line V-V of Fig. 2.

In the construction shown 1 is the cylinder to which the valve chest 2is secured by means of the studs 3. The main exhaust passes from thedrill to atmosphere through a port in the boss 4 on the valve chest 2.

In order to remove the dust and rock outtings from the hole beingdrilled a small portion of the actuating fluid is permitted e. Withthese and other objects in view an exto escape from the cylinder 1through the hollow drill steel 5 to the bottom of the hole. Undercertain conditions of operationit is found to be very desirabletoincrease the amount of the air passing through the drill steel-and atthe same timereduce'the drilling power and fspeedof the hammer drillmoreor less, while atother times it is desirable to continue 'thefiow of airthrough the hollowdrill steel while the hammer drill re. mainsinoperative.

The restricting and closing of the exhaust port is accomplished in thepresent'invention by an improved form of valve constructed as shown. Theport or bore in the boss 4 is made large enough to receive the bodyportion 6 of the valves preferably in the form of an open ended sleeve.The outer end of the valve 7 projects beyond the valve chest and isenlarged in diameter, the surface of which is knurled making it easy togrip and rotate by hand. The valve is further provided with alongitudinal hole 8 opening to the atmosphere at the outer end and witha lateral hole 9 passing through the side of the wall of the body 6 andcommunicating with the longitudinal hole 8.

In the position shown in Fig. 2 and Fig. 5 the exhaust is free to passfrom the exhaust chamber 10 of the valve chest, through openings 9 and 8to the atmosphere. A partial rotation of the valve to the left willreduce the size of the communication between 10 and 9 thus choking theexhaust, creating a back pressure in the cylinder, retarding theoperation of the hammer drill and increasing the flow of motive fluidthrough the drill steel 5. A still further rotation of the valve willclose the communication between 10 and 9, causing the hammer drill tocease operating but permitting the motive fluid to continue to flow fromthe cylinder hrough the drill steel to the bottom of the hole beingdrilled.

In order to secure the valve in thechest, a pin 11 is inserted in thechest 2 fitting in a groove 12 in the surface of the body 6 of thevalve. This groove 12 preferably extends only partially around thecircumferopening 9 registers Withthe exhaust recess 10 of the chest 2and when rotated to the other extreme of its movement the opening 9 isout of register With the recess 10 and the exhaust isefleetivelyvclosed. i

A detent, compr sing a spring pressed pin 13 is preferably provided tohold the valve in open, closed, or partially closed position, asdesired, a spring 14 serving to hold the end of the pin 13 pressed intoslight depresa other forms and modifications are included Within thespiritand scope of the same as expressed in the appended claim.

What I claim is:

In an exhaust closing valve'for rock drills, the combination of a valveseat having a bore ported at right angles to its axis intermediatethelength of the bore, a sleeve ;open at both endsforming a valve revolublymounted in the bore of said seat and having a port in said bore, manualoperating means in the form of a knurled head connected to the sleeveand projecting beyond the seat for turning the valve, spring lockingmeans lo- 'cated Within the Walls of the said seat and cooperating withthe said head for loeking the valve in any predetermined position, and apin andslot connectionbetween the sleeve and the seat for holding thevalve in the said seat and for limiting the rotativemovement of thevalve;

In testimony vvhereof, I have hereunto set my hand. J i p LEWIS BAYLES.

